Accession Number : AD0626376

Title :   INVESTIGATION OF FRACTURE IN CONNECTION WITH HOT DEFORMATION PROCESSING OF METALS.

Descriptive Note : Final rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY

Personal Author(s) : Grant ,Nicholas J. ; Bridenbaugh ,Peter ; Greene ,Barry ; Kane,Robert

Report Date : SEP 1965

Pagination or Media Count : 34

Abstract : Metals and alloys are normally hot worked at temperatures of 0.6 to 0.95 of their melting temperatures, in degrees Absolute, and at strain rates which may vary from as little as 0.1 to 10,000%/sec. Metals fail in tension, and are subject to tension forces in essentially all hot working operations at some stage of the working process. In the past, no one test method has been developed which encompasses these strain rates at these temperatures as a measure of hot plasticity. Recently a machine was developed which is capable of such performance, without suffering either from overstressing on loading or from impact. Three classes of materials were selected for study: (1) Udimet 700: a casting, semi-forgeable nickel-base super-alloy. (2) Molybdenum and molybdenum alloy TZC: body-centered-cubic materials, single and multi-phase materials, respectively, at hot working temperatures. (3) Iron and titanium, and their alloys: to provide materials undergoing a phase transformation, and thereby to permit comparison of atomic packing on hot plasticity; also to permit hot working of two-phase alloys in which both phases are ductile.

Descriptors :   (*FRACTURE(MECHANICS), HOT WORKING), (*HOT WORKING, FRACTURE(MECHANICS)), DEFORMATION, METALS, NICKEL ALLOYS

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE